I agree that I can not find the part number as well.Perhaps the Classic Center can help?

Here is the diagram from the Shop Manual.It is item #5 Oil Seal.I would call it more of an oil slinger because, if I recall correctly, it was just plain stamped steel that was packed with grease to help seal the rubber oil seal that it slid over.

The slinger is 187 357 02 82. It's in a parts manual supplement. If you have a supplement, it's occasionally useful to check it for later changes. No drawings though so some things are a bit obscure. It does refer back to pages in the original parts book.

No, it is #5. Regardless of what the description is in the diagram.If you compare the diagram to my photos, #6 is the oil seal with the rubber and the "spring reinforcement" inside the seal.Item #5 actually mounts onto the axle shaft and rotates with the axle.It helps to deflect oil away from the rubber seal where it rubs against the axle.